6551989 has 2 divisors, whose sum is σ = 6551990. Its totient is φ = 6551988.

The previous prime is 6551983. The next prime is 6552001. The reversal of 6551989 is 9891556.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5616900 + 935089 = 2370^2 + 967^2 .

It is a cyclic number.

It is not a de Polignac number, because 6551989 - 2⁵ = 6551957 is a prime.

It is a super-2 number, since 2×6551989² = 85857119712242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6551983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3275994 + 3275995.

It is an arithmetic number, because the mean of its divisors is an integer number (3275995).

Almost surely, 2^6551989 is an apocalyptic number.

It is an amenable number.

6551989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6551989 is an equidigital number, since it uses as much as digits as its factorization.

6551989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 43.

The square root of 6551989 is about 2559.6853322235. The cubic root of 6551989 is about 187.1218000288.

The spelling of 6551989 in words is "six million, five hundred fifty-one thousand, nine hundred eighty-nine".